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Find the slope of the line passing through the pairs of points

Algebra
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(2,8) (4,-6)

Dec 11th, 2014

Assuming the equation of the line is y=ax+b

Input (2,8), 8=2a+b          (1)

Input (4,-6), -6=4a+b      (2)

Equation 2-Equation 1, 

-6-8=4a+b-2a-b

-14=2a

a=-7

So the slope of the line is -7

Dec 11th, 2014

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Dec 11th, 2014
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